package com.woniuxy.usercoachassemble.webservice;

import java.io.IOException;
import java.util.concurrent.CopyOnWriteArraySet;

import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import org.springframework.stereotype.Component;

@Component
@ServerEndpoint("/websocket/{sid}")
public class WebSocketServer {

	// 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
	private static int onlineCount = 0;
	// concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
	private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();

	// 与某个客户端的连接会话，需要通过它来给客户端发送数据
	private Session session;

	// 接收sid
	private String sid = "";

	// 连接成功调用的方法
	@OnOpen
	public void onOpen(Session session, @PathParam("sid") String sid) {
		this.session = session;
		webSocketSet.add(this); // 加入set中
		addOnlineCount(); // 在线数加1
		System.out.println("有新窗口开始监听:" + sid + ",当前在线人数为" + getOnlineCount());
		this.sid = sid;

		try {
			sendMessage("连接成功");
		} catch (IOException e) {
			System.out.println("websocket IO异常");
		}

	}
	
	// 收到客户端消息后调用的方法
    @OnMessage
    public void onMessage(String message, Session session) {
        System.out.println("收到来自窗口"+sid+"的信息:"+message);
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            try {
                item.sendMessage(message);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    // 发生错误调用的方法
    @OnError
    public void onError(Session session, Throwable error) {
        System.out.println("发生错误");
        error.printStackTrace();
    }
    


	
	
	// 连接关闭调用的方法
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);  //从set中删除
        subOnlineCount();           //在线数减1
        System.out.println("有一连接关闭！当前在线人数为" + getOnlineCount());
    }
    
    

	// 实现服务器主动推送
	public void sendMessage(String message) throws IOException {
		this.session.getBasicRemote().sendText(message);
	}

    public static void sendInfo(String message,@PathParam("sid") String sid) throws IOException {
        System.out.println("推送消息到窗口"+sid+"，推送内容:"+message);
        for (WebSocketServer item : webSocketSet) {
            try {
                //这里可以设定只推送给这个sid的，为null则全部推送
                if(sid==null) {
                    item.sendMessage(message);
                }else if(item.sid.equals(sid)){
                    item.sendMessage(message);
                }
            } catch (IOException e) {
                continue;
            }
        }
    }

	
	
	

	public static synchronized int getOnlineCount() {
		return onlineCount;
	}

	public static synchronized void addOnlineCount() {
		WebSocketServer.onlineCount++;
	}

	public static synchronized void subOnlineCount() {
		WebSocketServer.onlineCount--;
	}

	public static CopyOnWriteArraySet<WebSocketServer> getWebSocketSet() {
		return webSocketSet;
	}

}
